Bryan Johnson Shows Simple Test to Gauge Biological Age

Bryan Johnson, founder of the neurotechnology firm Kernel, led a brief exercise on Tuesday that lets participants estimate their biological age.

Johnson presented the exercise to give people a straightforward, repeatable way to track how quickly their bodies are aging, a metric often hidden behind expensive lab tests.

The Long Play event, hosted by Business Insider, took place in a downtown San Francisco venue filled with entrepreneurs, investors, and health‑focused professionals eager for actionable longevity insights.

Johnson asked participants to stand with feet shoulder‑width apart, then perform a series of quick squats while timing how many repetitions they could complete in 30 seconds. Johnson said that the speed and depth of each squat correlate with muscle elasticity, cardiovascular efficiency, and, ultimately, biological age.

Attendees recorded their count, then used a simple chart Johnson provided to translate the number into an estimated biological age range. Those who completed more than 30 squats were placed in a younger bracket, while lower counts suggested faster aging.

Johnson said the exercise is not a diagnostic tool but a quick self‑check that can prompt people to adopt healthier habits or seek deeper testing.

Because the test requires no equipment and can be repeated weekly, it offers a low‑cost way for individuals to monitor progress from diet, sleep, or exercise changes.

While more comprehensive assessments like DNA methylation clocks remain the gold standard, Johnson’s demonstration highlights growing demand for everyday metrics that translate complex aging science into actionable personal data.

Johnson, who founded the neurotechnology startup Kernel in 2016, has invested heavily in longevity research, backing projects that map brain activity and develop wearable health monitors.

His interest in measuring biological age stems from a personal goal to live past 150 years, a target he says drives his public advocacy and private experiments.

The Long Play conference, organized by Business Insider, gathers innovators who explore long‑term health strategies, from gene therapies to lifestyle interventions, making it a fitting stage for Johnson’s hands‑on demo.

Audience members reported that the test felt more like a fitness challenge than a lab assessment, yet many said they left with a concrete number to track over time.

Health coaches and corporate wellness programs have begun incorporating quick bio‑age checks, hoping to motivate participants through visible metrics; Johnson’s demo could accelerate that trend.

Doctors caution that a single squat test cannot replace comprehensive medical evaluations, but they acknowledge that any tool prompting people to consider their aging trajectory may have preventive value.

**What this means**: The demonstration underscores a shift toward accessible, self‑administered health metrics in the longevity field. While not a substitute for clinical testing, such exercises can raise awareness, encourage lifestyle changes, and potentially feed larger datasets that refine age‑prediction science.